What is Wheel Offset and Backspace?

Wednesday, August 10, 2011 by Hunter Leffel
Wheel offset anTech Article on Offsetd backspace measure the same thing but in a little different way. They tell you where in the wheel well a particular wheel will sit.

Offset is a measurement in millimeters from the backside of the mounting plate to the center line of the wheel. A positive number puts the mounting plate further away from the backside of the rim. A negative measurement moves it closer to the backside. Since offset is based on the center line, the width does factor in. That is to say an 8-inch wide +45mm offset and 7-inch wide +45mm offset results in a 1/2" difference in wheel positioning. The 8-inch wide will be further into the wheel well. To gain a better understanding of the offset of a wheel, read our tech article on this topic.

Backspace measures the distance from the mounting plate to the back edge of the wheel.  The higher the backspace the further into the fender well it will sit.

Confusing? It can be. The good news is Tire Rack takes care of all the guesswork for you. When you shop by vehicle, we'll show you options that fit your vehicle. In some instances, there may be a fitment note explaining any potential issues, but in most cases no modifications are needed.

Comments on What is Wheel Offset and Backspace?

Tuesday, February 28, 2012 by Patrick Moore:
I currently own a 2009 Chevrolet Tahoe, 2WD, LTZ (Flex Fuel). I have been shopping around for a set of 22" wheels and tires but have been confused by the different "offset" options. I have been told that a 305-40-22 tire is optimal but the wheel width and offset is confusing me. Could you possibly provide some information that will enlighten me on this matter? Thanks in advance for your help.
Tuesday, February 28, 2012 by hunter:
Hi Patrick,
The great part of how Tire Rack makes wheel recommendations is we take all of the hard work out of the equation. You can do a shop by vehicle and we will show you the wheels that will fit without rubbing and be inside the wheel well, unless otherwise noted on a specific item. The backspace and offset info is there as well for your reference.

Wednesday, September 5, 2012 by Alan Paulson:
58 Chevy Biscayne. Want to run rear 255.50.17 tire on an 8" rim, and smaller diameter tire (235) on a 17 inch rim for the front. Which rims works best in this scenario
Thursday, January 3, 2013 by Marcus:
Question: Vehicle:2011 Hyundai Elantra Touring SE 17" x low profile (stock). Although the set handles well on dry pvmt,the tyres that go w/those do not meet my needs (more varied terrain/ more effect M&S. What is chance for 16" rims and higher profile tyres that accommodate more choices of tyres.
Thanks for your answer in advance.
Friday, January 4, 2013 by Hunter:
Hi Marcus,
A 205/55r16 or 215/55r16 will fit that vehicle.
Monday, March 4, 2013 by Tom Pellegrini:
so i have a pair of xd monster rims 18x9 with 18mm offset.I need to figure out the back spacing on these rims. any input i would greatly appreciate.
thanks for replies
Tuesday, March 5, 2013 by Hunter:
That should have a backspace of around 5.75"
Monday, June 24, 2013 by Toby:
i have a 1991 GMC suburban with a 4" lift and i was wanting some 10" wide rims. what kind of offset would i need so i would still have the same steering ans so it wouldn't rub on my leaf springs?
Tuesday, June 25, 2013 by R Fleschner:
I have a set of Bridgestone Blizzak WS70 215/55R16, one season old. Will these work on 16" steel wheels for a 2013 Toyota hybrid Camry? These are excellent tires and I would hate to give them up!
Tuesday, June 25, 2013 by Hunter:
Hi Toby,
Tire Rack is not able to guarantee wheel and tire fitments on modified vehicles. My nest suggestion is to go back to the manufacturer of your lift kit. They should be able to give guidance on what wheel/tire combo will clear with their kit.
Tuesday, June 25, 2013 by Hunter:
Hi R,
The 215/55R16 looks to be too short. I wouldn;t recommend that.
Monday, August 12, 2013 by Luther Harvey:
I just got a 2005 Jeep Wrangler unlimited and I am looking to get a set of +1 or +2 rims/wheel configuration. I like when I see jeeps with the wheels flush with the outside fender or stick out a little bit. The current tires are 31 x 10.5 R15. I don't want more tire sitting in the wheel well when I upsize...just the opposite. What should I look for when I shop for wheel/tire package?
Tuesday, September 17, 2013 by Chris:
I have a 2001 E430 sport RWD all stock. I was wondering if I could fit a 19x9 wheel all around with a 33 offset. If so, what size tire would you recommend?
Wednesday, September 25, 2013 by JJ:
Will the stock wheels from a 2010 MB E550 that are 18x8.5 and 18x9 staggered with 245/45/18 fit my 2006 MB C280 4Matic without any problems? Thanks!
Sunday, December 8, 2013 by Susan Pense:
I have a 2011 Ram 1500 4x2 - I was given a set of 20x10 rims with a -25 offset and 4.62 backside and 5x5.50 bolt pattern for my birthday. I want to use 275/65/20 BFG and add a 2" leveling kit on the front - will this work without cutting my bumper/fenders?
Tuesday, March 18, 2014 by David Mazurek:
Want new wheels to fit 2004 Dodge Ram 1500 Quad Cab (5.7 gas)with my 305/70/17 tires. I understand stock offset is +25.4mm and stock backspacing is 5.50 inches. How wide of a wheel should I go? (No lift kit.) What offset, backspace should I have with that width?

PS Why doesn't an 8" wide rim with a 4" back space have a 0mm offset? Wouldn't the 4" backspace put the mounting surface exactly in the middle of the wheel, therefore 0mm offset? Hmmmm.

Not wasting your time, purchased multiple times from you. Same name, email was mazurekd@matc.edu
Wednesday, March 19, 2014 by hunter:
Hi David,
Best way to know what will fit is to shop by vehicle on our website. The backspace and wheel width measurements are done from different points.
Sunday, April 27, 2014 by Larry Hinton:
Want new wheels and tires to fit 2013 Chevy 2500HD.Getting 7.5 suspension lift and want 35x12.5x20 tires. I am confused by backspacing and offset for new rims. I want BMF wheels but they are offered in 0mm offset. Does this make the rim and tire stick out from the fender?
Tuesday, April 29, 2014 by hunter:
Hi Larry,
With a 7" lift anything we list for the truck when you shop by vehicle will fit.

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